Interspinous fusion device

Abstract

The utility model relates to the technical field of medical instruments, and particularly discloses an interspinous fusion device. The device comprises a main fixing plate, an auxiliary fixing plate and a fixing column used for fixing the relative positions of the main fixing plate and the auxiliary fixing plate. The main fixing plate comprises a first main body and a plurality of mesh cage arc plates fixedly connected to one end of the first main body, all the mesh cage arc plates are circumferentially and uniformly distributed around a first axis, and the first main body is provided with a first fixing part fixedly connected to a spinous process; the auxiliary fixing plate is detachably installed on the main fixing plate and comprises a second main body and positioning arc plates fixedly connected to one end of the second main body, the number of the positioning arc plates is the same as that of the mesh cage arc plates, all the positioning arc plates are evenly distributed in the circumferential direction of the second axis, and the second main body is provided with a second fixing part fixedly connected to the spinous process; the mesh cage arc plates and the positioning arc plates are matched in a staggered and inserted mode, and a connecting cavity is defined by all the mesh cage arc plates and all the positioning arc plates. The connecting cavity is filled with the fixing columns. The structure of the device is optimized, and fusion between spinous processes is achieved while the fixing requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an interspinous process fusion device. Background Art

[0002] In posterior lumbar spine surgery, lumbar disc removal, bone grafting and fusion supplemented by internal fixation have become common methods for treating degenerative diseases of the lower lumbar spine. Thorough decompression and reliable bone fusion are the key to the success of the operation, and internal fixation is an important means to obtain firm bone fusion. Interspinous process fusion is a fusion technique that uses interspinous process bone grafting supplemented by interspinous process internal fixation to restore the stability of the corresponding segment. Interspinous process fusion can not only increase the fusion area of ​​the lumbar spine and improve the stability of the fusion segment, but also has the advantages of simple surgical operation and less bleeding. At present, the internal fixators used in the operation are diverse. Due to the different shapes and structures of various internal fixators, they all have high specificity and certain limitations in clinical applications.

[0003] In the prior art, pedicle screw internal fixation systems are the most commonly used, which use a method of placing the main and auxiliary fixation plates on both sides of the spinous process for fixation, which are connected by screws. However, this type of system still has disadvantages such as complex surgical exposure, risk of nerve root and dural sac damage, and long operation time. Utility Model Content

[0004] The purpose of the utility model is to provide an interspinous process fusion device to achieve structural optimization, reduce installation difficulty, reduce damage to the body, and achieve interspinous process fusion while meeting fixation requirements.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] An interspinous process fusion device is fixedly installed on the spinous process, comprising a main fixing plate, a secondary fixing plate and a fixing column; the main fixing plate comprises a first main body and a plurality of mesh cage arc plates fixedly connected to one end of the first main body, all of the mesh cage arc plates are circumferentially evenly distributed around a first axis, the first main body has at least two first fixing parts, and the first fixing parts are fixedly connected to the spinous process; the secondary fixing plate is detachably installed on the main fixing plate, the secondary fixing plate comprises a second main body and a positioning arc plate fixedly connected to one end of the second main body, the number of the positioning arc plates is the same as that of the mesh cage arc plates, all of the positioning arc plates are circumferentially evenly distributed around the second axis, the second main body has at least two second fixing parts, the second fixing parts are fixedly connected to the spinous process, the mesh cage arc plates are staggered and plugged into the positioning arc plates, and all of the mesh cage arc plates and all of the positioning arc plates form a connecting cavity; the fixing column fills the connecting cavity, and the fixing column is used to fix the relative position of the main fixing plate and the secondary fixing plate.

[0007] As a preferred technical solution of the interspinous process fusion device, the first body is penetrated by a first through hole, the first through hole is connected to the connecting cavity; and / or the second body is penetrated by a second through hole, the second through hole is connected to the connecting cavity.

[0008] As a preferred technical solution for the interspinous process fusion device, every two adjacent mesh cage arc plates are connected by a mesh cage member, and the mesh cage member includes a plurality of mesh cage rods. All the mesh cage rods in the mesh cage member are evenly spaced along a direction parallel to the first axis, and the mesh cage rods are against the inner wall of the positioning arc plate.

[0009] As a preferred technical solution for the interspinous process fusion device, a plurality of avoidance grooves are evenly distributed on the side surfaces of the first body, and the inner wall of the positioning arc plate is pressed against the bottom of the avoidance grooves; and / or a plurality of positioning through holes are passed through the first body, and the positioning arc plate is inserted into the positioning through holes.

[0010] As a preferred technical solution for the interspinous process fusion device, all of the positioning arc plates are divided into at least two first positioning arc plates and at least two second positioning arc plates, each of the first positioning arc plates passes through one of the avoidance grooves, and each of the second positioning arc plates is connected to one of the positioning through holes.

[0011] As a preferred technical solution of the interspinous process fusion device, a positioning protrusion is fixedly connected to the outer wall of the first positioning arc plate, and the positioning protrusion extends into the avoidance groove.

[0012] As a preferred technical solution of the interspinous process fusion device, the first fixing part includes a plurality of first spikes, which are inserted into the spinous processes; and / or the second fixing part includes a plurality of second spikes, which are inserted into the spinous processes.

[0013] As a preferred technical solution of the interspinous process fusion device, the first fixing part also includes a first positioning hole and a first screw, the first positioning hole passes through the first body, the first screw passes through the first positioning hole and is screwed to the spinous process; and / or the second fixing part also includes a second positioning hole and a second screw, the second positioning hole passes through the second body, the second screw passes through the second positioning hole and is screwed to the spinous process.

[0014] As a preferred technical solution of the interspinous process fusion device, all of the first spikes are evenly distributed circumferentially around the axis of the first positioning hole, and all of the second spikes are evenly distributed circumferentially around the axis of the second positioning hole.

[0015] As a preferred technical solution of the interspinous process fusion device, the fixing column is a screw rod of a bolt or a bone cement solid.

[0016] Beneficial effects of the utility model:

[0017] The interspinous process fusion device, with the help of the first fixing part and the second fixing part, enables the main fixing plate and the auxiliary fixing plate to be accurately installed on the predetermined position of the spinous process, which facilitates the main fixing plate and the auxiliary fixing plate to position the spinous process from both sides. After the first axis and the second axis are overlapped, the auxiliary fixing plate and the main fixing plate can be firmly connected. The main fixing plate and the auxiliary fixing plate are initially positioned through the design of the staggered plug-in cooperation of the mesh cage arc plate and the positioning arc plate. With the setting of the fixed column, the design requirement of fixing the relative position of the main fixing plate and the auxiliary fixing plate can be met. Through the above structural optimization design, the structure is simple and reliable, the difficulty of installation is reduced, and the damage to the spinous process is reduced, so that the interspinous process fusion can be achieved while meeting the fixing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of the interspinous process fusion device provided by an embodiment of the utility model;

[0019] Figure 2 It is a schematic structural diagram of the interspinous process fusion device provided by an embodiment of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the main fixing plate provided by an embodiment of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the auxiliary fixing plate provided in an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the spinous process provided by an embodiment of the utility model;

[0023] Figure 6 It is an exploded view of the interspinous process fusion device and the spinous process provided by the embodiment of the utility model from a first perspective;

[0024] Figure 7 is an exploded view of the interspinous process fusion device and the spinous process provided by the embodiment of the utility model from a second perspective;

[0025] Figure 8 It is a structural schematic diagram of the interspinous process fusion device and the spinous process provided by an embodiment of the utility model from a first perspective;

[0026] Fig. 9 It is a structural schematic diagram of the interspinous process fusion device and the spinous process from a second perspective provided by an embodiment of the utility model.

[0027] In the figure:

[0028] 100, main fixing plate; 110, first main body; 111, first positioning hole; 112, first spur; 113, avoidance slot; 114, positioning through hole; 120, cage arc plate; 130, cage rod;

[0029] 200, auxiliary fixing plate; 210, second main body; 211, second positioning hole; 212, second spur; 220, positioning arc plate; 230, positioning protrusion;

[0030] 900. Spinous process. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] like Figures 1 to 9 As shown, this embodiment provides an interspinous process fusion device, which is fixedly installed on the spinous process 900, including a main fixing plate 100, a secondary fixing plate 200 and a fixing column; the main fixing plate 100 includes a first body 110 and a plurality of mesh cage arc plates 120 fixedly connected to one end of the first body 110, all of the mesh cage arc plates 120 are uniformly distributed around the first axis, and the first body 110 has at least two first fixing parts, and the first fixing parts are fixedly connected to the spinous process 900; the secondary fixing plate 200 is detachably installed on the main fixing plate 100, and the secondary fixing plate 200 includes a second body 21 0 and a positioning arc plate 220 fixed to one end of the second main body 210, the number of the positioning arc plates 220 and the mesh cage arc plates 120 is the same, all the positioning arc plates 220 are evenly distributed around the second axis, the second main body 210 has at least two second fixing parts, the second fixing parts are fixedly connected to the spinous process 900, the mesh cage arc plates 120 and the positioning arc plates 220 are staggered and plugged together, all the mesh cage arc plates 120 and all the positioning arc plates 220 form a connecting cavity; the fixing column fills the connecting cavity, and the fixing column is used to fix the relative position of the main fixing plate 100 and the auxiliary fixing plate 200.

[0036] The interspinous process fusion device, by means of the arrangement of the first fixing part and the second fixing part, respectively enables the main fixing plate 100 and the auxiliary fixing plate 200 to be accurately installed on the predetermined position of the spinous process 900, which facilitates the main fixing plate 100 and the auxiliary fixing plate 200 to position the spinous process 900 from both sides. After the first axis and the second axis are overlapped, the auxiliary fixing plate 200 and the main fixing plate 100 are firmly connected. The design of the staggered plug-in cooperation of the mesh cage arc plate 120 and the positioning arc plate 220 realizes the preliminary positioning of the main fixing plate 100 and the auxiliary fixing plate 200. With the arrangement of the fixing column, the design requirement of fixing the relative position of the main fixing plate 100 and the auxiliary fixing plate 200 can be met. Through the above structural optimization design, the structure is simple and reliable, the difficulty of installation is reduced, and the damage to the spinous process 900 is reduced, so that the fusion between the spinous processes 900 can be achieved while meeting the fixing requirements.

[0037] In this embodiment, the interspinous process fusion device is applied to the lumbar spinous process. In other implementations of this embodiment, the interspinous process fusion device is applied to the spinous process 900 of other parts of the human body. The specific application scenario is determined by technicians in this field according to engineering practice, and will not be elaborated here.

[0038] Specifically, the first axis is parallel to the length direction of the first body 110 , and the second axis is parallel to the length direction of the second body 210 .

[0039] In one implementation of the present embodiment, the first body 110 is penetrated by a first through hole, and the first through hole is connected to the connection cavity. In another implementation of the present embodiment, the second body 210 is penetrated by a second through hole, and the second through hole is connected to the connection cavity. In another implementation of the present embodiment, the first body 110 is penetrated by a first through hole, and the first through hole is connected to the connection cavity, and the second body 210 is penetrated by a second through hole, and the second through hole is connected to the connection cavity.

[0040] The provision of the first through hole and the second through hole facilitates the connection between the connection cavity and the external environment. The above design optimizes the assembly method of the fixing column, reduces the difficulty of arranging the fixing column, and simplifies the specific structure of the interspinous process fusion device.

[0041] In this embodiment, every two adjacent cage arc plates 120 are connected by a cage member, and the cage member includes a plurality of cage rods 130. All the cage rods 130 in the cage member are evenly spaced in a direction parallel to the first axis, and the cage rods 130 abut against the inner wall of the positioning arc plate 220. The arrangement of the cage rods 130 plays a role in limiting the positioning arc plate 220, reducing the risk of the positioning arc plate 220 being offset; at the same time, the cage rods 130 also play a role in improving the structural stability of the cage arc plate 120, reducing the risk of the cage arc plate 120 being offset or bent and deformed due to accidents.

[0042] In one implementation of the present embodiment, a plurality of avoidance grooves 113 are evenly distributed on the side of the first body 110, and the inner wall of the positioning arc plate 220 presses against the bottom of the avoidance grooves 113. In another implementation of the present embodiment, a plurality of positioning through holes 114 are penetrated through the first body 110, and the positioning arc plate 220 is plugged into the positioning through holes 114. In another implementation of the present embodiment, a plurality of avoidance grooves 113 are evenly distributed on the side of the first body 110, and the inner wall of the positioning arc plate 220 presses against the bottom of the avoidance grooves 113, and a plurality of positioning through holes 114 are penetrated through the first body 110, and the positioning arc plate 220 is plugged into the positioning through holes 114.

[0043] By means of the avoidance groove 113 and the positioning through hole 114, the positioning arc plate 220 can be positioned, thereby ensuring that the positioning arc plate 220 can be accurately installed in place, reducing the risk of positional displacement of the positioning arc plate 220. At the same time, the interlocking cooperation between the positioning through hole 114 and the positioning arc plate 220 also helps to improve the connection stability between the auxiliary fixing plate 200 and the main fixing plate 100, thereby reducing the risk of accidental component separation of the interspinous process fusion device, ensuring the working stability of the interspinous process fusion device, and helping to ensure smooth fusion between the spinous processes 900.

[0044] Furthermore, all the positioning arc plates 220 are divided into at least two first positioning arc plates and at least two second positioning arc plates, each of the first positioning arc plates passes through an avoidance groove 113 , and each of the second positioning arc plates is connected to a positioning through hole 114 .

[0045] Through the above settings, the number of avoidance grooves 113 and positioning holes 114 is limited, and the layout positions of the positioning arc plates 220 and the mesh cage arc plates 120 are planned, thereby achieving structural limitations on the auxiliary fixing plate 200 and the main fixing plate 100, ensuring that the mesh cage arc plates 120 and the positioning arc plates 220 can be smoothly staggered and plugged in, ensuring the smooth formation of the accommodating cavity, and thus ensuring the stable operation of the interspinous process fusion device.

[0046] Furthermore, a positioning protrusion 230 is fixedly connected to the outer wall of the first positioning arc plate, and the positioning protrusion 230 extends into the avoidance groove 113. The design of the positioning protrusion 230 extending into the avoidance groove 113 plays a fool-proof role, reduces the relative position dislocation of the first fixing part and the second fixing part due to mistakes, helps to improve the accuracy of the interspinous process fusion device, and thus speeds up the setting speed of the interspinous process fusion device.

[0047] In one implementation of this embodiment, the first fixing portion includes a plurality of first thorns 112, and the first thorns 112 are inserted into the spinous process 900. In another implementation of this embodiment, the second fixing portion includes a plurality of second thorns 212, and the second thorns 212 are inserted into the spinous process 900. In another implementation of this embodiment, the first fixing portion includes a plurality of first thorns 112, and the first thorns 112 are inserted into the spinous process 900, and the second fixing portion includes a plurality of second thorns 212, and the second thorns 212 are inserted into the spinous process 900.

[0048] By providing the first spur 112 and the second spur 212, the spinous process 900 can be positioned by inserting the spurs into the side of the spinous process 900, thereby satisfying the design requirement that the first fixing part and the second fixing part are fixedly connected to the spinous process 900, reducing the risk of accidental position displacement of the main fixing plate 100 and the auxiliary fixing plate 200, ensuring the stability of the connection, and ensuring the long-term stable operation of the interspinous process fusion device.

[0049] Specifically, the two first fixing portions are located at two ends of the first body 110 , and the two second fixing portions are located at two ends of the second body 210 .

[0050] Furthermore, the first fixing part further includes a first positioning hole 111 and a first screw, the first positioning hole 111 penetrates the first body 110, the first screw passes through the first positioning hole 111 and is screwed to the spinous process 900; the second fixing part further includes a second positioning hole 211 and a second screw, the second positioning hole 211 penetrates the second body 210, the second screw passes through the second positioning hole 211 and is screwed to the spinous process 900. The design of the screw passing through the positioning hole and being screwed to the spinous process 900 further ensures the connection stability between the fixing part and the spinous process 900, and avoids the risk of the auxiliary fixing plate 200 being separated from the spinous process 900 and the risk of the main fixing plate 100 being separated from the spinous process 900.

[0051] Furthermore, all the first spurs 112 are evenly distributed around the axis of the first positioning hole 111, and all the second spurs 212 are evenly distributed around the axis of the second positioning hole 211. By defining the relative position between the positioning holes and the spurs, the specific structure of the fixing part is optimized, the positioning effect of the fixing part on the spinous process 900 is guaranteed, and the space occupied by the fixing part is reduced.

[0052] Specifically, the axis of the first positioning hole 111 is parallel to the length direction of the first body 110 , and the axis of the second positioning hole 211 is parallel to the length direction of the second body 210 .

[0053] In this embodiment, the fixing column is a screw rod of a bolt or a bone cement solid. By injecting bone cement or screwing the bolt, the fixing column can fill the accommodating cavity, thereby achieving a stable connection between the main fixing plate 100 and the auxiliary fixing plate 200, effectively avoiding the relative position deviation of the main fixing plate 100 and the auxiliary fixing plate 200. The above connection method is simple and reliable, has high connection stability and low production cost.

[0054] The present embodiment also provides an assembly method of an interspinous process fusion device, which is applied to the above-mentioned interspinous process fusion device, and includes the following steps: clamping the spinous process 900 from both sides of the main fixing plate 100 and the auxiliary fixing plate 200, using a pressure clamp to bring the main fixing plate 100 and the auxiliary fixing plate 200 closer to the middle, so that the cage arc plate 120 and the positioning arc plate 220 are staggered and plugged into each other, inserting the spur of the fixing part into the spinous process 900, and then passing the screw through the positioning hole and screwing it to the spinous process 900, and finally filling the accommodating cavity with the fixing column.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An interspinous process fusion device, fixedly mounted on the spinous process (900), characterized in that: include: The main fixing plate (100) comprises a first main body (110) and a plurality of mesh cage arc plates (120) fixedly connected to one end of the first main body (110), wherein all the mesh cage arc plates (120) are evenly distributed circumferentially around a first axis, and the first main body (110) has at least two first fixing portions, and the first fixing portions are fixedly connected to the spinous process (900); The auxiliary fixing plate (200) is detachably mounted on the main fixing plate (100), and the auxiliary fixing plate (200) comprises a second main body (210) and a positioning arc plate (220) fixedly connected to one end of the second main body (210). The number of the positioning arc plates (220) is the same as that of the mesh cage arc plates (120), and all the positioning arc plates (220) are uniformly distributed circumferentially around the second axis. The second main body (210) has at least two second fixing parts, and the second fixing parts are fixedly connected to the spinous process (900). The mesh cage arc plates (120) and the positioning arc plates (220) are staggered and plugged together, and all the mesh cage arc plates (120) and all the positioning arc plates (220) form a connecting cavity; A fixing column fills the connection cavity, and the fixing column is used to fix the relative position of the main fixing plate (100) and the auxiliary fixing plate (200).

2. The interspinous process fusion device according to claim 1, characterized in that: The first body (110) has a first through hole extending therethrough, the first through hole being connected to the connecting cavity; and / or A second through hole passes through the second body (210), and the second through hole is connected to the connecting cavity.

3. The interspinous process fusion device according to claim 1, characterized in that: Every two adjacent cage arc plates (120) are connected via a cage member, wherein the cage member comprises a plurality of cage rods (130), wherein all the cage rods (130) in the cage member are evenly spaced in a direction parallel to the first axis, and the cage rods (130) abut against the inner wall of the positioning arc plate (220).

4. The interspinous process fusion device according to claim 1, characterized in that: A plurality of avoidance grooves (113) are evenly distributed on the side surface of the first main body (110), and the inner wall of the positioning arc plate (220) is pressed against the bottom of the avoidance grooves (113); and / or The first main body (110) is penetrated by a plurality of positioning through holes (114), and the positioning arc plates (220) are inserted into the positioning through holes (114).

5. The interspinous process fusion device according to claim 4, characterized in that: All of the positioning arc plates (220) are divided into at least two first positioning arc plates and at least two second positioning arc plates, each of the first positioning arc plates passes through one of the avoidance grooves (113), and each of the second positioning arc plates is connected to one of the positioning through holes (114).

6. The interspinous process fusion device according to claim 5, characterized in that: A positioning protrusion (230) is fixedly connected to the outer wall of the first positioning arc plate, and the positioning protrusion (230) extends into the avoidance groove (113).

7. The interspinous process fusion device according to claim 1, characterized in that: The first fixing portion includes a plurality of first thorns (112), and the first thorns (112) are inserted into the spinous process (900); and / or The second fixing portion includes a plurality of second spikes (212), and the second spikes (212) are inserted into the spinous process (900).

8. The interspinous process fusion device according to claim 7, characterized in that: The first fixing portion further comprises a first positioning hole (111) and a first screw, wherein the first positioning hole (111) passes through the first body (110), and the first screw passes through the first positioning hole (111) and is screwed to the spinous process (900); and / or The second fixing portion further comprises a second positioning hole (211) and a second screw, wherein the second positioning hole (211) passes through the second body (210), and the second screw passes through the second positioning hole (211) and is screwed to the spinous process (900).

9. The interspinous process fusion device according to claim 8, characterized in that: All of the first spurs (112) are evenly distributed circumferentially around the axis of the first positioning hole (111), and all of the second spurs (212) are evenly distributed circumferentially around the axis of the second positioning hole (211).

10. The interspinous process fusion device according to any one of claims 1 to 9, characterized in that: The fixing column is a screw rod of a bolt or a bone cement solid.

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